Blue-flame gas-burner



G.l BAKER.

BLUE FLAME GAS BURNER.

APPLICATION FILED JAN. 3l, l9l9. 1,330,048, Patented Feb. 10,1920.

A llllllll u GREELEY BAKER, OF CHICAGO, ILLINOIS.

BLUE-FLAME GAS-BURNER.

Specification of Letters Patent.

Patented Feb. 10, 1920.

Application led January 31, 1919. Serial No. 274.265.

To (1U yfrito/n 'it may concern Be it known that I, GREELEY BAKER, a citizen of thc United States of America, and a resident ot' Chicago, county of Cook, and State o'f Illinois, have invented certain new and useful Improvements in Blue-Flame Gas-Burners, of which the following is a specification.

This invention relates to blue-fiame gas burners of the Bunsen type and is especially adapted for use in places where all of the oxygen required for combustion is supplied by the burner.

The main objects of this invention are to provide an improved gas burner in which the mixing chamber and the air and gas inlets are of such form and dimensions as to provide a proper mixture for blue-flame combustion and' discharge the same before it reaches its ignition temperature; to provide improved means for mixing and distributing the gaseous mixture within the burner; to provide an improved form and arrangement of the fuel and air ducts; and to provide an improved construction for the various parts of the burner.

Illustrative embodiments of this invention are shown in the accompanying drawings, in which- Figure 1 is a longitudinal vsection of the complete burner, the dotted lines representing boundaries of a furnace chamber or other inclosure.

Fig. 2 is a side view of the same, partly broken away and omitting the insulation.

Fig. 3 is a fragmentary sectional view showing slightly modiied forms of the mixing chamber and burner cap.

Fig. 4 is a plan of thel burner cap shown in Figs. 1 and 2.

Fig. 5 is a plan of the modified form of burner cap shown in Fig. 3.

Fig. 6 is a top view of the burner with the burner cap and .distributing means removed.

Fig. 7 is a sectional view on the line A7-7 of Fig. 1.

Fig. 8 is a section on the line 8 8 of Fig. 1.

Fig. 9 is a top view of the spiral guide member.

Fig. 10 is a top view of the needle valve.

In the form shown the burner comprises a burner body 1. air and fuel ducts 2 and 3 respectively, a fitting 4 for controlling the admission of air to said air duct, and a fit ting 5 having means for regulating the How of gas and means for imparting a spiral motion to the air and gas as they enter the mixing chamber.

The burner body 1 has a cylindrical tubular part 6 within which the fitting 5 is adapted to enter and this cylindrical part is connected by a contracted neck 7 With a flared head 8 provided Witha burner cap 9 detachably secured thereto. The body 1. has threaded engagement with the air duct 2 within which is concentrically arranged the fuel duet 3.

The fitting 5 fits loosely Within the bore 6 and has threaded engagement with the discharge end of the fuel duct 3. Spiral grooves 10 in the periphery of fitting 5 serve as air passages therethrough. A central passage 11 communicates With the fuel duct 3. A needle valve 12, adjustably mounted in the passage l1, has threaded engagement with the member 5 and coacts with a tapered gas nozzle 13 to regulate the 'How of fuel from the duct 3. Spiral grooves 14. cut into the periphery of the body of the needle valve impart a spiral motion to the gas. v

The passage through the neck 7 is provided with a bushing which is gradually contracted to a point above and near the gas nozzle lnnd then is gradually increased to form an expanding chamber 15. The gas enters the contracted portion of the bushing at a high velocity, drawing air with it, and

when it enters the expanding chamber it loses its velocity and by a well-known dynamic principle, gains in pressure so that when the gaseous mixture has reached the chamber 16 formed by the iared walls of' the headvS, it has a relatively low velocity and high pressure. The said bushing in the neck 7 is fundamentally a Venturi-tube of the form used in the ordinary injector, and for maximum efficiency should be proportioned to suit the gas pressure with which the device is to be used.

In order to obviate the necessity of making many diiierent sizes of burners and permit the burner body to be of standard design and dimensions for different conditions, the Venturi-tubes are made in the form of linings 17 l having standard external dimensions to fit 4the standard body, but having different internal dimensions. In the preferred form of construction, as shown in. Fig. 1, the internal diameter of the neck 7 is substantially uniform through.

mixing chamber, a burner-cap secured thereto, an insulating jacket surrounding said chamber, a pair of ducts extending to a distance from said chamber for supplying gas and air respectively, the air duct having an inlet port remote from said mixing chamber and an adjustable valve for said port, and restricted neck ejector means adapted by reason of the gas pressure to draw in air and to expel the inherently combustible mixture forcibly from said chamber through said cap at a velocity greater than the rate of propagation of inflammation.

3. A gas burner, comprising an air duct, a gas duct, a burner body detaehably secured to one end of said air duct, a gas nozzle on said gas duct and directed into said burner body, said 'body having a. hollow neck, a head formed on the outer end of said burner proper, a lining mounted in said neck, said lining being contracted to form an orifice intermediate the' ends thereof, the inner walls of said lining being flared outwardly from said orifice, the upper end of said linin having recesses formed therein, and a spherical body loosely mounted on said upper end of said lining for distributing the gaseous mixture which passes through said recesses.

4. A gas burner, comprising a body having air and gas inlet means at one end, a perforated cap at the other end', and a contracted neck between said ends, the contracted passage through said neck being cylindrical, a lining fitting said cylindrical passage and flared at one end to fit the adjacent part of said body and held in place therein by having its opposite end expanded, the interior of said lining being of venturi form, and means providing air and gas inlets directed into the end of said lining which is distant from said burner cap.

Signed at Chicago this 25th day of Jan., 1919.

GREELEY BAKER. 

